<p>Spoiler: (highlight to see)<table style="background-color: black; color: black"><tr><td><font color=black>This sentence was in a spoiler tag then I edited the post and got this.</font></td></tr></table>

EDIT 2: ..damn, wow. I'd say a possible explanation is because [ SPOILER ] is seen in bbcode as shorthand for that big code above, so when you go back to edit it it gives you the full code (but with < > symbols instead of the bbcode standard [ ] which accounts for why it falls apart). So the solution is to, when editing spoiler-tag posts, go back and re-type [ SPOILER ] in their right places.

EDIT 2: ..damn, wow. I'd say a possible explanation is because [ SPOILER ] is seen in bbcode as shorthand for that big code above, so when you go back to edit it it gives you the full code (but with < > symbols instead of the bbcode standard [ ] which accounts for why it falls apart). So the solution is to, when editing spoiler-tag posts, go back and re-type [ SPOILER ] in their right places.

Right. Although I seem to recall this occurring before a long time ago, possibly right after the spoiler tags were introduced, and it getting fixed. I'm just hoping it can get fixed again to save time and effort on poster parts.